<?php

class AccessAction extends Action{
	
	
	
	function getAccessToken() {
		// access_token 应该全局存储与更新，以下代码以写入到文件中做示例
		
		$ClientID = C('ClientID');
		$APPID = C('WX_APP_ID');
		$APPSECRET = C('WX_APP_SECRET');
		
		$data = json_decode($this->get_php_file(TEMP_PATH."access_token_{$ClientID}.php"));
		
		if ($data->expire_time < time()) {
			// 如果是企业号用以下URL获取access_token
			// $url = "https://qyapi.weixin.qq.com/cgi-bin/gettoken?corpid=$this->appId&corpsecret=$this->appSecret";
			$url = "https://api.weixin.qq.com/cgi-bin/token?grant_type=client_credential&appid={$APPID}&secret={$APPSECRET}";
			var_dump($url);
			$res = json_decode($this->httpGet($url));
			$access_token = $res->access_token;
			if ($access_token) {
				$data->expire_time = time() + 7000;
				$data->access_token = $access_token;
				$this->set_php_file(TEMP_PATH."access_token_{$ClientID}.php", json_encode($data));
			}
		} else {
			$access_token = $data->access_token;
		}
// 		var_dump($access_token);
		return $access_token;
	}
	
	private function set_php_file($filename, $content) {
		$fp = fopen($filename, "w");
		fwrite($fp, "<?php exit();?>" . $content);
		fclose($fp);
	}
	
	private function get_php_file($filename) {
		return trim(substr(file_get_contents($filename), 15));
	}
	
	private function httpGet($url) {
		$curl = curl_init();
		curl_setopt($curl, CURLOPT_RETURNTRANSFER, true);
		curl_setopt($curl, CURLOPT_TIMEOUT, 500);
		// 为保证第三方服务器与微信服务器之间数据传输的安全性，所有微信接口采用https方式调用，必须使用下面2行代码打开ssl安全校验。
		// 如果在部署过程中代码在此处验证失败，请到 http://curl.haxx.se/ca/cacert.pem 下载新的证书判别文件。
		curl_setopt($curl, CURLOPT_SSL_VERIFYPEER, false);
		curl_setopt($curl, CURLOPT_SSL_VERIFYHOST, false);
		curl_setopt($curl, CURLOPT_URL, $url);
	
		$res = curl_exec($curl);
		curl_close($curl);
		var_dump($res);
		return $res;
	}
}